H-5 Task 1 Flashcards
What is total rise?
What is total run?
- Vertical distance from finished floor to finish floor
- Horizontal distance from face of the bottom riser to the face of the top riser
What does Rise mean?
What does Run mean?
What does nosing line mean?
Vertical distance from one tread to the next
Horizontal distance from one tread to the next
Is an imaginary line drawn along the top edge of the nosing
What does Tread Depth mean?
What does Headroom mean?
Difference between Rough stairwell opening and Finished stairwell opening?
Sum of the run plus the nosing
Vertical distance from the nosing line to the underside of the floor above
Finished is horizontal distance from edge of stair nosing at the top upper landing.
Rough is typically 3” (75mm) larger than the finished opening
what does Stringer Support Board mean?
what does Unit of Bridge mean?
what does Effective Depth mean?
also known as ‘hanger board’, used to attach the stairs at the top to the floor opening
the hypotenuse of the rise and run triangle, used to calculate the stringer length
sometimes referred to as the ‘throat’, the material from the inside cut to the bottom of the stringer
what is the minimum effective depth of a stringer?
3-1/2” (90mm)
what is the minimum overall depth of stringer board?
Width
9-1/4’ (235mm)
why are builders using LVL stock for stringers?
LVL is more dimensionally consistent and stronger than lumber
What are the types of staircases?
Cut-out
- cut out (notched)
- solid - dadoed
- semi-housed - cleated
- mitred - housed
- laminated into a curved stringer
whats another name for stringers?
-‘Stair horse’ or ‘carriage’
*
how can you reduce the thickness of a stringer?
using a support wall below the stringer, the thickness can be reduced actual thickness of 1”
38mm if unsupported
what is another name for cut-out stringer?
‘notched’ it is the most common type of stringer
where are cleated stringers used?
and other than wood, what other material can be used as a cleat?
commonly used outdoor construction or
temporary stairs
steel angle iron brackets are also used
for dadoed stringers, what is the depth of the dadoed notch?
equals 1/3 stringer thickness
where are housed stringers used?
what methods can you use for laying out rise and run?
Typically used in finished stairs
templates which are commercially made and are adjustable. or you can use the rise and run layout of the building square.
(include allowance for wedges to tighten the treads and risers in place)
how many parts does a semi housed stringer have?
two: a cut out stringer and a plain stringer
cut out is laminated to the finished plain stringer
when would you use a mitred stringer?
one or both side of the stringer are open (exposed staircase)
what are curved stringers made from?
for wooden stringers, what is used for curved stringers?
- wood, concrete, and steel
- Laminated layers of thin plywood
why is it important to ensure dryness in balustrade material?
tightly fastened posts will loosen considerably as they air dry
what is the max spacing of balusters?
spaced that 100mm diameter cannot pass through them
where would you use a buttress cap?
under balusters, shaped to take the end of the balusters and can be directly on the floor of a landing or raised off the floor to form a bottom rail
how many landings in a narrow “U” stairs?
how many flights of stairs in a wide “U” stairs?
- two landings for “U’
- three staircases in a wide “U”, two landings still
how many sets of winders allowed between each floor level?
the turn of winders, what degree can the winders not exceed?
and what are the degrees of these tapered winders?
- Only one set of winders
- Cannot exceed 90 degrees, tapered treads are 30 or 45 degrees
what are landings used for?
turning staircases or break the total rise to create shorter flights of stairs
what is the maximum total rise for a flight of staircase?
what does ‘flight’ mean?
- 3.7 metres
- stairs from one landing to another
what is the minimum length and width of landings?
minimum lengths of 860mm to 1100mm depending on the staircase configuration, width is to match the staircase width
two flights of staircases in between floors, are they required to be the same rise and run?
BC Building code doesn’t require it, but its good building practice
what are the main parts of the balustrade?
newel post, handrails, balusters
when is a landing require in a stairway?
when the total rise for a stairway is greater than 3.7m
what is the difference of long ‘L’ stair and wide ‘L’ stair?
a long ‘L’ has a long flight and a short flight connected by a landing or winders
a wide ‘L’ has two similar length flights at right angles to each other
